Annual energy analysis of concrete containing phase change materials for building envelopes

“…Two practices have applied in order to face this crucial situation. The first one is the optimization of the building cell [5,6] in order to reduce the energy demand on cooling and heating loads. The second way is to exploit renewable energy sources, mainly solar energy, for covering a great part of the loads.…”

Section: Introductionmentioning

confidence: 99%

Exergetic and energetic comparison of LiCl-H 2 O and LiBr-H 2 O working pairs in a solar absorption cooling system

Bellos

Tzivanidis

Antonopoulos

2016

Energy Conversion and Management

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“…For example, these properties determine the heat flow into and out of the building as well as the maximum and time lag in the building thermal load [11,12].…”

Section: Introductionmentioning

confidence: 99%

Thermal conductivity of cementitious composites containing microencapsulated phase change materials

Ricklefs

Thiele

Falzone³

et al. 2017

International Journal of Heat and Mass Transfer

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This thesis investigates the effects of adding microencapsulated phase change materials (PCM) on the thermal conductivity of cement paste and cement mortar composites. Embedding cementitious composites with microencapsulated PCM has been considered a promising method for increasing the thermal mass of buildings to achieve greater energy efficiency. Cement paste and cement mortar samples were synthesized with a constant water to cement ratio of 0.45. Both contained microencapsulated PCM with diameter ranging from 17-20 µm, volume fraction up to 30%, and a melting temperature around 24˚C. The cement mortar also contained quartz grains 150-600 µm in diameter such that the sum of the volume fractions of quartz and microencapsulated PCM was fixed at 55%.All samples were aged for more than 28 days. Their effective density and free moisture content were systematically measured. A guarded hot plate apparatus was designed, assembled, and validated according to the ASTM C177 to measure the effective thermal conductivity of the aged specimens of cement paste and cement mortar without and with microencapsulated PCM. Measurements were 2 performed between 10 and 40˚C, encompassing the entire PCM phase change temperature window. The effective thermal conductivity of both the cement paste and the cement mortar composites was found to be nearly independent of temperature in the range considered. It also decreased as the volume fraction of microencapsulated PCM increased. Finally, excellent agreement was obtained between experimental data and the effective medium approximation derived by Felske (2004) for core-shell-matrix composites. 3The thesis of Alex Ricklefs is approved.

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“…Osterman et al [8] presented a study on PCM thermal storage systems of buildings for space heating and cooling on an annual basis using 30 plates filled with paraffin. Thiele et al [9] demonstrated that addition of a PCM to the exterior wall in average size home results in a reduction of annual cooling load in Los Angeles and San Francisco from 53% to 82% and 85% to 100%, respectively. Diaconu and Cruceru [10] carried out a simulation of a three functional layer wall with two different PCM wallboards as outer layers and polystyrene thermal insulation board as the middle layer.…”

Section: Introductionmentioning

confidence: 99%

Thermal Performance Analysis of Multi-Phase Change Material Layer-Integrated Building Roofs for Energy Efficiency in Built-Environment

2017

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Thermal energy storage using phase change materials (PCMs) plays a significant role in maintaining thermal comfort and reducing energy consumption in a building because of its ability to absorb/release heat within small temperature variations. In this paper, the thermal performance of roofs has been investigated based on various factors like the integration of a single PCM layer, integration of a double PCM layer, the thickness of the PCM, phase transition temperature and heat of fusion of the PCM. The analysis shows that integration of a single PCM layer of different thickness and phase transition temperature and heat of fusion in roof structures is unable to maintain a comfortable constant temperature inside the building due to incomplete solidification and melting of the PCM. However, the analysis shows that with multi-PCM layers of appropriate thickness it is possible to maintain a constant comfortable temperature of about 28 • C in the building throughout the day in Chennai, India. The analysis also shows that there is reduction in heat gain by 17 to 26% for a single PCM layered roof and 25 to 36% for a double PCM layered roof compared to the roof without PCM layer for the different months of the year.

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Annual energy analysis of concrete containing phase change materials for building envelopes

Cited by 64 publications

References 23 publications

Exergetic and energetic comparison of LiCl-H 2 O and LiBr-H 2 O working pairs in a solar absorption cooling system

Exergetic and energetic comparison of LiCl-H 2 O and LiBr-H 2 O working pairs in a solar absorption cooling system

Thermal conductivity of cementitious composites containing microencapsulated phase change materials

Thermal Performance Analysis of Multi-Phase Change Material Layer-Integrated Building Roofs for Energy Efficiency in Built-Environment

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